The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2005
Filed:
Dec. 02, 2003
Joseph D. Farley, Villeneuve Loubet, FR;
Joseph D. Farley, Villeneuve Loubet, FR;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A power switching circuit including an MOS power switching transistor (P) is disclosed. The power switching transistor (P) has a body node that is selectably biased to either its source or its drain, depending upon a comparison of the voltage at the circuit input (IN) relative to the voltage at the circuit output (OUT). In a reverse voltage situation in which the output voltage exceeds the input voltage, a first body node switching transistor (P) connected between the body node of the power switching transistor (P) and its source is turned off by a voltage corresponding to the output voltage, as conducted from the drain of the power switching transistor (P) through a pull-down device (P) in an inverter. Also in this reverse voltage situation, the gate of the power switching transistor (P) is isolated from a control input (ON_/OFF) by series pass transistors (N, N; P, P), and the power switching transistor (P) is held off by a bias transistor (P), with a gate voltage also corresponding to the output voltage.